ZIP code 91016: Monrovia, CA
ZIP code 91016 is in Monrovia (91% of residents), South Monrovia Island (5.1%) and Mayflower Village (4.3%), in Los Angeles County, California. It is in California's 31st congressional district. Its state senate districts are State Senate District 25 (95%) and State Senate District 22 (5.1%); its state house districts are Assembly District 41 (90%) and Assembly District 48 (10%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Monrovia | 91% |
| South Monrovia Island | 5.1% |
| Mayflower Village | 4.3% |
| County | Share of ZIP residents |
|---|---|
| Los Angeles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Upper San Gabriel Valley CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| California's 31st congressional district (CA-31) | 100% |
Members of Congress
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CA-31) | Gilbert Ray Cisneros, Jr. (D) | 202-225-5256 |
| U.S. Senator | Adam B. Schiff (D) | 202-224-3841 |
| U.S. Senator | Alex Padilla (D) | 202-224-3553 · contact form |
Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 25 | 95% |
| State Senate District 22 | 5.1% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 41 | 90% |
| Assembly District 48 | 10% |
Voting precincts
17 voting precincts overlap ZIP 91016. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:91016")
ZIP 91016 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.